研究目的
Investigating the effects of random terpolymers on the generation of large-area BHJ films and their solar cell properties to achieve highly reproducible and efficient large-area PSCs.
研究成果
The random terpolymer BDT-Th10 effectively suppressed irregular and unclear phase separation and large aggregation of the active materials, inducing more gradual and regular phase separation with optimized BHJ morphology. This resulted in high solar cell efficiency of 7.74% in organic photovoltaic modules with an active area of 58.5 cm2 and film thickness over 350 nm, demonstrating the importance of controlling BHJ film formation for achieving high solar cell efficiency and generating an optimized BHJ morphology over a large active area.
研究不足
The study focuses on the scalability of PSC devices and the reproducibility of BHJ morphology over large areas. However, the performance of PSC devices still suffers from substantial efficiency drops when scaled up, and the development of donor polymers that can reproducibly form large-area, thick BHJ films with ideal morphology is needed.
1：Experimental Design and Method Selection:
The study involved the synthesis of random terpolymers by incorporating benzodithiophene into a highly crystalline copolymer. The effect of these terpolymers on BHJ film formation and solar cell properties was investigated.
2：Sample Selection and Data Sources:
The polymers were synthesized via Stille coupling reactions, and their properties were characterized using UV-vis absorption spectroscopy, DSC, TEM, and GI-WAXD.
3：List of Experimental Equipment and Materials:
Instruments used include PerkinElmer Lambda 35 UV-vis spectrometer, TA instruments Q50 thermal analysis system, FEI TitanTM 80-300 TEM, and GI-WAXD for molecular packing properties.
4：Experimental Procedures and Operational Workflow:
PSC devices were prepared with an architecture of ITO/ZnO/active layer/MoO3/Ag. The active layers were prepared by bar-coating using a solution of the polymer and PC71BM.
5：Data Analysis Methods:
The charge carrier mobilities of the BHJ films were measured using a space-charge-limited current (SCLC) model, and carrier recombination was investigated by measuring Jsc as a function of the incident light intensity.
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